Quality control coding: Difference between revisions
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'''In progress | '''[In progress] | ||
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'''Shear-probe quality-control flags''' | '''Shear-probe quality-control flags''' | ||
The Q (quality control) flags associated with shear-probe measurements are | The Q (quality control) flags associated with shear-probe measurements are bitwise flags with boolean values which are CF compliant. More information available here: https://mplnet.gsfc.nasa.gov/about-flags | ||
Every dissipation estimate from every probe must have Q flag. | Every dissipation estimate from every probe must have Q flag. | ||
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! Flag Meaning | ! Flag Meaning | ||
! Example threshold value | ! Example threshold value | ||
| Ex: True =1 / False =0 | |||
| Ex: Q value | |||
|- | |- | ||
| 1 | | 1 | ||
| Bit 0 | | Bit 0 | ||
| | | Poor figure of merit | ||
| | | 1.15 | ||
| 0 | | 0 | ||
| 0 | | 0 | ||
| Line 28: | Line 28: | ||
| 2 | | 2 | ||
| Bit 1 | | Bit 1 | ||
| | | Large fraction of data with spikes | ||
| | | 5% | ||
| 0 | | 0 | ||
| 0 | | 0 | ||
| Line 35: | Line 35: | ||
| 4 | | 4 | ||
| Bit 2 | | Bit 2 | ||
| | | Anomalously large disagreement between dissipation estimates from probes | ||
| | | 2.772 | ||
| 1 | | 1 | ||
| 4 | | 4 | ||
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| 8 | | 8 | ||
| Bit 3 | | Bit 3 | ||
| | | Too many iterations of despiking routine | ||
| | | 8 | ||
| 0 | | 0 | ||
| 0 | | 0 | ||
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| 16 | | 16 | ||
| Bit 4 | | Bit 4 | ||
| | | Insufficient variance resolved | ||
| 50% | | 50% | ||
| 1 | | 1 | ||
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| 0 | | 0 | ||
| 0 | | 0 | ||
|- | |||
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| Final Q = 20 | | Final Q = 20 | ||
|} | |} | ||
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The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2. | The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2. | ||
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return to [[Flow chart for shear probes]] | |||
[[Category: Shear probes]] | [[Category: Shear probes]] | ||
Latest revision as of 09:18, 28 August 2023
[In progress]
Shear-probe quality-control flags
The Q (quality control) flags associated with shear-probe measurements are bitwise flags with boolean values which are CF compliant. More information available here: https://mplnet.gsfc.nasa.gov/about-flags
Every dissipation estimate from every probe must have Q flag. The numerical values of the Q flags are as follows:
| Flag Mask | Bit | Flag Meaning | Example threshold value | Ex: True =1 / False =0 | Ex: Q value |
|---|---|---|---|---|---|
| 1 | Bit 0 | Poor figure of merit | 1.15 | 0 | 0 |
| 2 | Bit 1 | Large fraction of data with spikes | 5% | 0 | 0 |
| 4 | Bit 2 | Anomalously large disagreement between dissipation estimates from probes | 2.772 | 1 | 4 |
| 8 | Bit 3 | Too many iterations of despiking routine | 8 | 0 | 0 |
| 16 | Bit 4 | Insufficient variance resolved | 50% | 1 | 16 |
| 32 | Bit 5 | manual flag to be defined by user | N/A | 0 | 0 |
| 64 | Bit 6 | manual flag to be defined by user | N/A | 0 | 0 |
| 128 | Bit 7 | manual flag to be defined by user | N/A | 0 | 0 |
| Final Q = 20 |
The Q flags are combined by their addition. For example a Q value of 20 means that the dissipation estimated failed both dissipation ratio limit test and the resolved variance test. A value of 255 means that all tests failed. The reasons for a failure can be decoded by breaking the value of Q down to its powers of 2.
return to Flow chart for shear probes
